# One less arrow vector than asked for

Bug introduced in 10.0.0 and persisting through 11.0.1 or later

Consider the following code:

f[t_, y_] := t + y;
VectorPlot[(#1/Norm[#1] &)[{1, f[t, y]}], {t, -3, 3}, {y, -3, 3},
Frame -> False, Axes -> True, AxesLabel -> {t, y},
VectorPoints -> 11,
VectorScale -> Tiny,
VectorStyle -> {"Segment", GrayLevel[0.5]}
]


But I only get 10 by 10 vectors instead of 11 by 11. Is this a bug?

• i get the expected output (11 by 11 vector points) in version 9 (Windows 8 64bit). In version 10, something strange is happening with VectorPoints->11 -- other values seem to work fine. – kglr Jan 16 '15 at 5:31
• Try with {t, -4, 4}, {y, -4, 4}. Is the result as expected? – user9660 Jan 16 '15 at 8:20
• Desired result in v8.0.4 and v9.0.1. I think it's reasonable to consider it as a bug. – xzczd Jan 17 '15 at 3:43
• Interestingly this works on 10.0.1 but is broken again on 10.0.2 – Gordon Coale Jan 19 '15 at 8:20
• related 73950. – Kuba Feb 28 '16 at 9:49